Loving the look of Tabletop Club, especially that outdoor chess. Looks like you’ve been extremely busy, with the trailer showing an absolute tonne of interesting features.
Having started my Godot journey on 4.0, 4.3 seems pretty stable to me. I’ll be releasing my first game, Unicopia, using Godot 4.3 in about 6 weeks, and the engine and IDE have been stable enough since at least 4.1 for a 2D game, and I suspect it’s a similar story for 3D.
The IDE used to crash a bit, back around 4.1, and there’s been a few dead end changes that the Godot team have had to roll back (looking at you, Web builds and SharedArrayBuffers) but on the whole I’ve found 4.x reliable.
That said, game engines are so complex it seems to be there’s always a bit of flux in feature stability across releases, so your mileage might vary. For me the worst gotcha I came across was Binary tokenization on export was reintroduced in 4.3 and enabled by default. As it reintroduced problems with localised resources, it broke my asian fonts, and it took me forever to find the issue, which was quickly fixed by disabling binary tokenization.
Nonetheless, if 4.3 has features you need, or if you have long-term plans for Tabletop Club, then I’d personally recommend you consider migrating across.